<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        div {
            margin: 180px auto;
            width: 900px;
            height: 400px;
            border: 1px;
            background: #F2F3E1;
            text-align: center;
            border: 5px solid transparent;
            border-radius: 10px;
        }

        div h1 {
            margin-top: 60px;
            font-size: 110px;
            color: #8F8E8C;
        }

        div p {
            font-size: 16px;
            margin-top: 20px;
            color: orange;
        }

        div span {
            margin: 30px auto 0 auto;
            display: block;
            width: 220px;
            height: 30px;
            border-radius: 30px;
            background-color: #8F8E8C;
            text-align: center;
            line-height: 30px;
            color: #fff;
        }
    </style>
</head>

<body>
    <div>
        <h1>404</h1>
        <p>not Found&nbsp;&nbsp;找不到你要访问的页面~~~</p>
        <span>back</span>
    </div>
</body>

</html>